Psychology › Section G · Thinking and intelligence › Topic G.5
Measures of intelligence
An IQ score is a single number, but behind it lie more than a century of test design, statistics and some of psychology's darkest history. This topic explains how intelligence tests are built and scored, what a score does and does not mean, and how testing has been used and misused.
In this topic
- A tool with two histories
- Galton and Binet
- From mental age to IQ
- Worked example: the ratio IQ and its flaw
- Wechsler and the deviation IQ
- What makes a test trustworthy
- The bell curve
- Worked example: reading a score
- Testing and the eugenics movement
- The ends of the curve
- Common mistakes to avoid
- Key takeaways
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